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M17-15

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Joined: 02 Sep 2009
Posts: 47101
M17-15 [#permalink]

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New post 16 Sep 2014, 01:01
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A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

95% (00:21) correct 5% (00:16) wrong based on 318 sessions

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Expert Post
Math Expert
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Joined: 02 Sep 2009
Posts: 47101
Re M17-15 [#permalink]

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New post 16 Sep 2014, 01:01
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Manager
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Joined: 16 Jul 2017
Posts: 60
Location: United Kingdom
GMAT 1: 660 Q47 V34
GPA: 3.87
Re: M17-15 [#permalink]

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New post 07 Nov 2017, 12:19
Break 42 * 36 down into prime numbers --> 42 * 36 = (7)(3)(2) * (3)(3)(2)(2) or (7^1)(3^3)(2^3)
Now we need to check the answers to see if there are any prime factorisations that don't match up with the above.

A. 12 = (3)(2)(2) -- this is OK
B. 18 = (3)(3)(2) -- this is OK
C. 21 = (7)(3) -- this is OK
D. 28 = (7)(2)(2) -- this is OK
E. 49 = (7)(7) -- not OK! The original prime factorisation only has one 7, therefore this is NOT a divisor!
Re: M17-15   [#permalink] 07 Nov 2017, 12:19
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M17-15

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